Sequential Fourm 4 voice Analog Synthesizer

The Sequential Fourm is a 4-voice compact analog synthesizer launched in late 2025, offering a portable and more affordable entry point into the Sequential sound. It features dual oscillators, a 4-pole low-pass filter, and a 37-note keyboard with polyphonic aftertouch, delivering classic Prophet-5 analog tones. 

• 4-Voice analog synthesizer with polyphonic aftertouch
• 37-key slim-key keyboard with polyphonic aftertouch for compact expressive potential
• Design inspired by Prophet-5 voice for authentic Sequential sound
• Dual oscillators with simultaneous waveform selection
• Multiple unison modes for powerful monophonic playing
• Oscillator B features LFO ranges
• Oscillator sync capability
• 4-Pole resonant low pass filter with bass compensation
• Oscillator mixer section with noise source and aggressive feedback drive
• 2x ADSR envelopes
• Multimode arpeggiator with glide-per-step sequencer mode
• Multi-wave LFO with S+H
• Pro-One inspired modulation section for intuitive routing
• Main mono output and headphone output
• MIDI 5-Pin DIN input, output, and thru
• USB for bidirectional MIDI
• Footswitch or expression pedal input